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charset="gb2312" Content-Transfer-Encoding: quoted-printable

here is a demo:

```

  1. #include "= ;sox.h"
  2. #include "= ;util.h"
  3. #include <s= tdio.h>
  4. #include <a= ssert.h>
  6. /* = Example of reading and writing audio files&nb= sp;stored in memory buffers
  7.  * rather than ac= tual files.
  8.  *
  9.  * Usage: example5&nbs= p;input output
  10.  */
  13. int main(int argc, char * argv[])=
  14. {
  15.   static&n= bsp;sox_format_t * in, * out;
  16.   #define MAX_SAM= PLES (size_t)2048
  17.   sox_sample_t samples[MAX_SAMPLES];
  18.   char&nbs= p;* buffer;
  19.   size_t&n= bsp;buffer_size;
  20.   size_t&n= bsp;number_read;
  22.   assert(argc =3D=3D&n= bsp;3);
  24.   assert(sox_init() = =3D=3D SOX_SUCCESS);
  25.   assert((in =3D = sox_open_read(argv[1], NULL, NULL, NULL)));
  26.   sox_encodinginf= o_t out_encoding =3D {
  27.     SOX_ENCODING_= ULAW,
  28.     8,
  29.     0,
  30.     sox_option_de= fault,
  31.     sox_option_de= fault,
  32.     sox_option_de= fault,
  33.     sox_false
  34.   };
  35.   sox_signalinfo_= t out_signal =3D {
  36.     800= 0,
  37.     1,
  38.     0,
  39.     0,
  40.     NU= LL
  41.   };
  42.   assert(out =3D = sox_open_memstream_write(&buffer, &buffer_size, &out_= signal, &out_encoding, "wav", <= span class=3D"hljs-literal" style=3D"box-sizing:border-box;color:rgb(1, 132= , 187)">NULL));
  43.   while&nb= sp;((number_read =3D sox_read(in, samples, MAX_SAMPLES)= ))
  44.     assert(sox_wr= ite(out, samples, number_read) =3D=3D number_read);
  45.   sox_close(out);
  46.   sox_close(in);
  48.   printf(<= span class=3D"hljs-string" style=3D"box-sizing:border-box;color:rgb(80, 161= , 79)">"%ld\n", buffer_size);
  50.   free(buf= fer);
  51.   sox_quit();
    52.   return&n= bsp;0;
  52. }

```

$ ./example5 in.wav out.wav

$ 58


At this li= ne 48: `printf("%ld\n", buffer_size);`
I take it for granted that it should be the length of the whole file= =A3=ACbut due to the seek option=A3=ACI can only get length of wav header.<= /div>

I know it is feasible to get file data before sox_close through ft.fp,= but at some situations I need get data from buff and buffsize.
=B7=A2=BC=FE=C8=CB: Jan Sta= ry <hans@stare.cz>
=B7=A2=CB=CD=CA=B1=BC=E4: 2021=C4=EA7=D4=C224=C8=D5 18:43
=CA=D5=BC=FE=C8=CB: sox-users@lists.sourceforge.net <sox-users@li= sts.sourceforge.net>
=D6=F7=CC=E2: Re: [SoX-users] Incorrect work of sox_open_memstream_w= rite with memstream buffer and buffersize
 
On Jul 23 01:43:36, hisunzhenliang@outlook.com wro= te:
> Opened by sox_open_memstream_write function=A3=ACthe buffer and buffer= size will work incorrectly when seeking back=A1=A3
>
> For example=A3=AC when opening buffer with sox_open_memstream_write to= get a wav format output=A3=ACwav handler's  stopwrite function will s= eek back to the beginning to rewrite wav header. In this situation=A3=ACaft= er closing ft=A3=ACI assume that I can get whole data from buff and buffsize=A3=ACbut I can only get the wav header.
>
> I don't think it would be better to have seek back to the end when you= need to rewrite data with a seek operation.

Without seeing the actual code,
it's hard to try to help.



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